Well atleast some stuff we had before, but got taken from us.
+Weapons
-Mines, Explosives etc.
+Weapon Enhancements
-Customize Weapon Attachments Realtime (In game when playing very useful and fast)
-Ability to use Laser and Scope attachments (seriously? 3.0)
+Map Interactivity
-Vehicles (fun sometimes, good team work, but can be annoying good for only some maps)
-Very Large Maps(good fun, nice air space)
-Doors (doors you can open and shut, like in wars)
-Circle Jumping(whats crysis without it? worse.)
+Player Enhancements
-Sprint Like a Man (Do not use suit energy to sprint)
-Prone (laying gives greater aim, useful for dive, hide and recovery)
-The old school suit mode selector (middle mouse)
-Hands Switch - To Fists (for MAXIMUM view space and higher mobility, nano punch)
-Parachuting (We need this online to jump off high buildings and survive, just like we could jump out of helecopters and vtol in cwars)
+Game Type
-PowerStruggle (played for ingame currency to buy vehicles, prototype weapons etc, not days leveling up with a system like Cod's. Great type, bring it back!)
+Server
-Player Limit (32) (clans do also enjoy bigger matches sometimes)
-Spectator Mode (not only clans used this alot in cwars)
-Ping (in numbers)
-Being able to click "host game", so friends can just go (type in your ip) and have a mess around on the map.(only dedicated servers do not allow this feature)
-Auto Map Downloads
-Dedicated Server files
-Server Side Modding (cheat preventation, extended game life)
If some of these are already in Crysis 2 then let me know, but I wrote these down much earlier last year and they were not at that point in the game.
-Dual